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Windows 7: My Windows shuts down unexpectedly

Hi,i have a big problem with my laptop.After i replaced its motherboard which i bought it from China online,my laptop closes every 2 hours,but without like shutting down on the screen or anything,it just turns off.The guy who replaced the motherboard didn't installed a new windows after,he just replaced it and gave it to me like that.Another thing is that aparrently my hard drive is on 26% health,maybe this could be a reason? but before the new motherboard everything was fine.And now please i need some help because it drives me crazy every 2 hours .And everytime is 2 hours,like it has a timer or something inside and knows when those 2 hours passed.I'm thinking to buy a new hard drive to replace this one,to install a new windows and i'll see after.So any suggestions would help.Thank u

1. You replaced the motherboard on the laptop. Are you 100% certain its the right one for your machine? Might explain the HD health thing. Is it a quality board and under warranty? Have you updated the BIO's on it?
2. I don't think a "new" windows will solve anything. A new INSTALLATION, as you say was done should have fixed any software ( O.S.) problems.

My Windows shuts down unexpectedly

PC shuts down unexpectedlyHelp! my PC shuts down unexpectedly... I'm pretty sure it's not the CPU overheating because when idle it's at 37° and when I play games like NBA 2K14 its at 64°. Can you please help me with my problem :( :( :( my
Specs are:
AMD A8 5600K
Radeon HD 7560D
Corsair 4GB DDR3 memory
Seagate 500GB

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